FDA drug labeling and package insert information.
DailyMed API is a free Health API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Yes. The DailyMed API is listed in the Health category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The DailyMed API requires no authentication, so you can start making requests without signing up.
CORS support for the DailyMed API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The DailyMed API is served over HTTPS, so it's safe to use in production.